20211013213 has 2 divisors, whose sum is σ = 20211013214. Its totient is φ = 20211013212.

The previous prime is 20211013211. The next prime is 20211013231. The reversal of 20211013213 is 31231011202.

Together with next prime (20211013231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12059993124 + 8151020089 = 109818^2 + 90283^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211013213 - 2¹ = 20211013211 is a prime.

Together with 20211013211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211013211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105506606 + 10105506607.

It is an arithmetic number, because the mean of its divisors is an integer number (10105506607).

Almost surely, 2^20211013213 is an apocalyptic number.

It is an amenable number.

20211013213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211013213 is an equidigital number, since it uses as much as digits as its factorization.

20211013213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20211013213 its reverse (31231011202), we get a palindrome (51442024415).

The spelling of 20211013213 in words is "twenty billion, two hundred eleven million, thirteen thousand, two hundred thirteen".